Plex plays video locally but only audio when streaming to Samsung

I have Plex server running on a MacBook Air and I am trying to stream to a Samsung TV. Everything I have tried will play locally through Plex on the Air. However when I try to play stuff via the Plex app on the TV, some files will just play the audio, completely black screen for video, no subs, no interface, no nothing. Any ideas?

TIA

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